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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71de5cd2ead9f32d0c31291b6fc2ed2184f6b6a1f8bfec1dc6c30ee781dcbd45' 
  AND token = 'i9XMpk5wfB5mZqy3GlP9kgQ+2cFZFF7SJs1hEnE8hZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}